you need
  • - accelerometer;
  • - Roulette;
  • - stopwatch;
  • - Calculator.
To calculate the mass of a body that is affected by a known power use ratio, which is derived from Newton's second law.To do this, the accelerometer measures acceleration which is obtained by the impact body strength.If this device is not present, measure the speed at the beginning and end of the observation time of the body and divide the change in velocity in the future.This will mean the acceleration of the body of the measured time interval.Calculate the weight by dividing the value of the force acting on the body F, measured at m / s² acceleration a, m = F / a.If the force in Newtons to take, it will get a lot in kilograms.
Calculate the weight of the body on which the force of gravity.For this hang it on the load cell and the scale, determine the force that acts on the body.This will be the force of gravity.To determine the mass of the body, the value of this force FT divide the gravitational acceleration g≈9,81 m / s², m = F / g.For convenience in the calculation can take a value g≈10 m / s² in the event that does not require high precision determination of the mass in kilograms.
When the body moves in a circular path at a constant speed, it is also a force.If you know its value, find the mass of a body moving in a circular path.To do this, measure or calculate the velocity of the body.Measurements are made speedometer, if possible.To calculate the speed, measure the radius of the trajectory of a body with a tape measure or ruler R & T during full turn with a stopwatch, it is called the rotation period.The rate will be equal to the product of the number range of 6.28 divided by the period.Find a weight force F multiplied by the radius of the path of movement of the body and dividing the result by the square of its velocity m = F • R / v².To get the result in kilograms, speed is measured in meters per second range - in meters, and force - in Newton.